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Review-passive film properties and electrochemical response of different phases in a Cu-alloyed stainless steel after long term heat treatment
RISE, Swerea, KIMAB.
Jernkontoret, Sweden.
2016 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, no 7, p. C377-C385Article in journal (Refereed) Published
Abstract [en]

In this work the influence of copper (0-4 wt%) on the microstructure, passive film properties and local electrochemical response of 25Cr7Ni-type duplex stainless steel is investigated after long term heat-treatment at 800◦C for 6 months. This heat-treatment was done to promote the formation of different phases which could be studied in terms of passive film properties and electrochemical response. The unique microstructures of the alloys comprise austenite, sigma phase, Cr2N nitrides and, for the 2 wt% and 4 wt% Cu alloys, epsilon-Cu phase. The results show that alloying with Cu increases slightly the amount of isothermal Cr2N nitrides and epsilon-Cu phase, but decreases the sigma phase fraction. The location of pitting corrosion as well as the Electrochemical Potential (EP), or electron work function, measured with Scanning Kelvin Probe Force Microscopy (SKPFM) show that the epsilon-Cu phase has the lowest corrosion resistance. The EP appears to depend more on the composition of the underlying phase than on the thickness of the passive film. Cr-nitrides have the highest EP followed by sigma phase, austenite and epsilon-Cu phase. There is a clear decrease of EP of the austenitic phase when 2 wt% Cu is added in the alloy. 

Place, publisher, year, edition, pages
Electrochemical Society Inc. , 2016. Vol. 163, no 7, p. C377-C385
Keywords [en]
Alloy steel, Austenite, Chromium alloys, Chromium compounds, Copper corrosion, Corrosion resistance, Duplex stainless steel, Electrochemical corrosion, Heat treatment, Microstructure, Nitrides, Pitting, Steel corrosion, Austenitic phase, Electrochemical potential, Electrochemical response, Electron work functions, Passive Film properties, Passive films, Scanning Kelvin probe force microscopy, Sigma phase, Copper alloys
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-41159DOI: 10.1149/2.1101607jesScopus ID: 2-s2.0-85026354454OAI: oai:DiVA.org:ri-41159DiVA, id: diva2:1377376
Note

Funding text 1: This work was financed within the member programme “Stainless Steel” at Swerea KIMAB AB, with support from Outokumpu Stainless AB and AB Sandvik Materials Technology. Majid Sababi, KTH Royal Institute of Technology, is thanked for the help with SKPFM measurements, Ulf Bexell, Dalarna University and Jill Sundberg, Swerea KIMAB, for support with AES measurements and Niklas Pettersson, Swerea KIMAB for TEM analysis.

Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-11Bibliographically approved

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